Looking for dfcbase.jar

import com.documentum.fc.client.IDfSessionManager;

I have added dfc.jar file in the path class, but the compiler is not happy with the above import. I learned that there is another file dfcbase.jar , but I could not find it. Can any body tell me from where I may get this file.

Most of the people talk about C:\Program Files\Documentum\? but from where I may get SDK toolkit for Documentum that contains the required jar files.